On the same building in “Piazza Cavour” where we have an image of Hercules Labro, we can see another bas-relief representing Saint Julia, the patron saint of Livorno.
There are several different versions of the martirdom of the Saint in Corsica, but it seems that some monks from the Gorgona island carried her body to a sepulchre on their land. In 762, Desiderius, king of the Lombards, removed her relics to the Benedictine abbey of Brescia.
See also: Julia of Corsica (Wikipedia) - Another Walk
The Crucifixion of St Julia by Hieronymus Bosch